class MyRunable implements Runnable{
    @Override
    public void run() {
       while(true){
           System.out.println("hello r");
           try{
               Thread.sleep(1000);
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
       }
    }
}

public class demo2 {
    public static void main(String[] args) {
        MyRunable r = new MyRunable();
        Thread t = new Thread(r);

        t.start();

        while(true){
            System.out.println("hello main");
            try{
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
